Method of constructing metallic rectifier plates



Jan. 1-5, 1929. 1,698,921

C. E. OGDEN METHOD OF CONSTRUCTING METALLIC RECTIFIER PLATES Filed Feb. 17, 1928 Patented Jan. 1 5, 1929.

; UNITED STATES PATENT OFFICE.

CLARENCE E. OGD EN, OF CINCINNATI, OHIO, ASIGNOR TO THE KODEL RADIO POBATION, A CORPORATION OF OHIO.

METHOD OF CONSTBUCTING IETALLIC RECTIFIER PLATES.

Application filed February 17, 1928. Serial No. 255,137.:

In rectifier plates of the type ab'ove mentioned, the plate proper comprises one of the conductor terminals for-the rectifyingoxide film or films. In the practical construction of rectifying plates of this type, however, the entire plate must be heat treated, and thus the entire plate is, after processing, entirely covered with the films of oxide, and it is necessary that such filmsbe removed from a portion of the plate in order to provide a suitable terminal for the necessary electrical connections. This may be 'accomphshed by filing, sand-blasting or other similar method, but such processes require considerable time in the handling, thus adding materially to the cost of production. The oxide films, however, are relatively brittle, and I find that under proper treatment scale oil of the metal quite easily, and the. present method has for its principal object a constructionand proccss by neansof which such scaling may be effected from a part of the rectifying plate.

or unit to provide a suitable terminal. This Iaccomplishpreferably by forming the plate .With a terminal extension, upon which the oxide may be fractured, and from whichit may be scaled without rupturing the rectifying films on the plate proper.

In the drawings: V Figure 1 is a -plan view of a rectifier plate or unit constructedin accordance with this invention. 7

1, with terminals 2 may, it will be underl stood, be stamp d from sheet copper. The

plates or units are heat treated and cooled to form thereon oxide films 33, such films covering the entire superficial areas of the plate and terminal. In order to prepare the extension or terminal 2, so that it may receive the usual electricalconnector, it is necessary to remove the oxide therefrom,'and this I accomplish by means of a press 4 and dies 5, which are arranged to receive and corrugate the terminal, as shown in the several figures of the drawing. This corrugation of the terminal serves. to fracture the oxidefilms, and causes it to scale from the copper, thus leaving the copper clean and ceive the connector.

It will be understood that various modifications may be made in the present invention, Within the scope of the appended claims.

Having thus fully described my invention,

what I claim as new and desire to secure by Letters Patent is:

an oxide film on said plate, and then fractur- 7 7 ing the oxide on said extension by means of a die to cause it to scale therefrom.

3. The method of constructing metallic rectifier plates comprising forming a metalin condition to rep lic plate with a terminal extension, forming 30 an oxide film on said plate, and then corrugating said extension by means of a die to fracture said oxide and cause it to scale therefrom. a

CLARENCE E.- OGDEN. 

